Premises and Equipment (Narrative) (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
Property, Plant and Equipment [Line Items]
Depreciation		$ 55,100	$ 49,900	$ 41,000
Operating Lease, Rent Expense		45,600	46,000	42,100
Operating Lease, Right-of-Use Asset		281,438	292,087
Operating lease, payments		32,100	31,600
Recognition of right of use asset related to the new corporate headquarters facility	$ 121,700
Recognition of operating lease liability related to the new corporate headquarters facility	$ 121,700
Premises and Equipment
Property, Plant and Equipment [Line Items]
Operating Lease, Right-of-Use Asset		281,400	292,100		$ 170,500
Other Liabilities [Member]
Property, Plant and Equipment [Line Items]
Operating lease, liability		313,404	323,000		$ 174,400
Partnership Interest [Member]
Property, Plant and Equipment [Line Items]
Operating Lease, Rent Expense		$ 322	$ 9,800	$ 5,900